For loop is used in programming

 For loop is used in programming

A for loop is used in programming when you want to repeat a block of code a specific number of times or iterate through a collection such as an array or list.

1. Basic for loop in Java

for (int i = 0; i < 5; i++) {
    System.out.println(i);
}

Output:

0
1
2
3
4

How it works

for (initialization; condition; increment) {
    // code to execute
}

Part	Example	Purpose
Initialization	int i = 0	Creates and initializes the counter
Condition	i < 5	Determines whether the loop continues
Increment	i++	Increases the counter after each iteration

The execution happens like this:

i = 0 → 0 < 5 → print 0 → i++
i = 1 → 1 < 5 → print 1 → i++
i = 2 → 2 < 5 → print 2 → i++
i = 3 → 3 < 5 → print 3 → i++
i = 4 → 4 < 5 → print 4 → i++
i = 5 → 5 < 5 → STOP

2. for loop with an array

This is very common in Selenium/Java QA automation:

String[] browsers = {"Chrome", "Firefox", "Edge"};

for (int i = 0; i < browsers.length; i++) {
    System.out.println(browsers[i]);
}

Output:

Chrome
Firefox
Edge

3. Enhanced for loop

Java also provides a simpler for-each loop:

String[] browsers = {"Chrome", "Firefox", "Edge"};

for (String browser : browsers) {
    System.out.println(browser);
}

Here:

String browser

represents the current element, and:

: browsers

means "take each element from the browsers array."

4. QA/Selenium example

Suppose you want to test several URLs:

String[] urls = {
    "https://example.com",
    "https://google.com",
    "https://yahoo.com"
};

for (String url : urls) {
    driver.get(url);
    System.out.println("Testing: " + url);
}

The browser will navigate to each URL one at a time.

Interview answer:

What is a for loop?

Answer: A for loop in Java is a control-flow statement used to repeatedly execute a block of code based on a condition. It typically consists of initialization, condition, and increment/decrement. It is commonly used when we know how many times we need to execute the code or when iterating through arrays and collections.

Important: i++ means increase i by 1, while i-- means decrease i by 1.

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